EMarketer estimates that Facebook grew 13.6% in 2011, which comes after a 38.6% surge in 2010. By contrast, Twitter grew 31.9%, which comes after a 23.5% jump in 2010. The relative growth numbers are greatly influenced by the respective sizes of the networks.
At the end of 2011, Facebook claimed nearly 133 million U.S. users out of a total population of around 308 million. Twitter had a U.S. user base of 24 million.
However, while Facebook’s growth seems to have hit a plateau, Twitter’s size will double by 2014, eMarketer predicts.
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